function getBrowserInfo() {
     var t,v = undefined;
     if (window.opera) t = 'Opera';
     else 
	if (document.all) {
            t = 'IE';
            var nv = navigator.appVersion;
            var s = nv.indexOf('MSIE')+5;
            v = nv.substring(s,s+1);
        }
        else if (navigator.appName) t = 'Netscape';
 return {type:t,version:v};
}
 
function bookmark(a){
    var url = window.document.location;
    var title = window.document.title;
    var b = getBrowserInfo();
 
    if (b.type == 'IE' && 7 > b.version && b.version >= 4) window.external.AddFavorite(url,title);
    else if (b.type == 'Opera') {
             a.href = url;
             a.rel = "sidebar";
             a.title = url+','+title;
             return true;
     }
     else if (b.type == "Netscape") window.sidebar.addPanel(title,url,"");
     else alert("Нажмите CTRL-D, чтобы добавить страницу в закладки.");
 return false;
}


function emailCheck (emailStr) {
    var checkTLD=1;
    var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/i;
    var emailPat=/^(.+)@(.+)$/;
    var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
    var validChars="\[^\\s" + specialChars + "\]";
    var quotedUser="(\"[^\"]*\")";
    var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
    var atom=validChars + '+';
    var word="(" + atom + "|" + quotedUser + ")";
    var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
    var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
    var matchArray=emailStr.match(emailPat);

	if (matchArray==null) {
	    alert("Некорректно введен адрес (проверьте @ и .)");
	return false;
	}
    var user=matchArray[1];
    var domain=matchArray[2];

    for (i=0; i<user.length; i++) {
	if (user.charCodeAt(i)>127) {
	    alert("Ths username contains invalid characters.");
	    return false;
        }
    }

    for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
	    alert("Ths domain name contains invalid characters.");
	    return false;
        }
    }

    if (user.match(userPat)==null) {
	alert("Имя пользователя, не действительно..");
	return false;
    }

    var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	    for (var i=1;i<=4;i++) {
		if (IPArray[i]>255) {
		alert("Destination IP address is invalid!");
		return false;
        	}
	    }
	    return true;
	}

    var atomPat=new RegExp("^" + atom + "$");
    var domArr=domain.split(".");
    var len=domArr.length;
    
    for (i=0;i<len;i++) {
	if (domArr[i].search(atomPat)==-1) {
	    alert("Имя домена, не действительно.");
	    return false;
        }
    }

    if (checkTLD && domArr[domArr.length-1].length!=2 &&
	domArr[domArr.length-1].search(knownDomsPat)==-1) {
	alert("The address must end in a well-known domain or two letter " + "country.");
	return false;
    }

    if (len<2) {
	alert("This address is missing a hostname!");
	return false;
    }
  return true;
}